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Daylight harvesting control, or the practice of using light sensors to automatically reduce electric light in a space when sufficient daylight is present, has been demonstrated to produce significant energy cost savings in buildings. As a proven energy-saving strategy, it has been implemented into many sustainable building projects. It was also incorporated into ASHRAE/IES 90.1-2010 and IECC 2009/2012, the major energy standards. Daylight harvesting should soon become a staple in new construction.